Simply animate a mask ?

[Steve Roberts]

Set keyframes for the mask shape property. Check the Help.

[Jacob Wessler]

Start with your source (picture, video, solid)

Add your mask.
Twirl down your options (or hit MM in quick succession to show all the mask options)
Place a keyframe at the start of your animation
Move the playhead to another point in time
Change the shape of your mask

Make sure to lock all other layers so you don’t accidentally move one of them. You can also double-click your layer to open it in its own window and work on the mask there. Set up a side-by-side with your layer footage in one windown and your composition in the other and you can see (in real time) how chaning your mask will change your final result.

Repeat for as many keyframes as you need!

Jacob

[Martijn Merkelbag]

Thanks for the help guys !

I just made some very stupid mistake that did not make it animate.
Its all working now !

Thanks again.

greets, Martijn M